Preheat the oven to 325°F.
Season roast generously with salt and pepper. In a large Dutch oven, heat oil over medium-high. Sear roast on all sides until deeply browned (3–4 minutes per side). Remove from the pan and set aside.
Lower heat to medium. Add onion and cook until softened (5 min). Stir in garlic and tomato paste; cook 1–2 more minutes until fragrant and slightly caramelized.
Pour in the ale, scraping up browned bits. Add beef broth, Dijon mustard, thyme, rosemary, and bay leaves. Bring to a bubble and then return roast to pot and cover with the lid.
Braise in the oven for 2.5 to 3 hours, until beef is very tender. Option to add in baby potatoes and carrots into the dutch oven (if you have room) for the last hour. If not, you can boil, steam or roast those separately and serve together.
Finish with a quick zesty garlic herb topping: mix together some freshly chopped parsley and dill, zest from 1 lemon and 1 grated garlic clove. Use as a topping on top of the Ale Braised Pot Roast and potatoes/carrots.